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1、专业英语四级阅读模拟题24READINGCOMPREHENSIONTEXTATheenvironmentiseverythingthatsurroundsus：plants,animals,buildings,country,air,water—literallyeverythingthatmightaffectus•Theenvironmentofatown,withitsbuildingsandtrafficanditsnoiseandsmells,whereeveryoneisontopofeveryoneelse,isafarcr
2、yfromthatofthecountryside,withitsfieldsandcrops,itswildanddomesticanimalsanditsfeelingofspaciousness.Andtheenvironmentdiffersindifferentpartsoftheworld•Ecologyisthescienceofhowlivingcreaturesandplantsexisttogetheranddependoneachotherandonthelocalenvironment.Whereanenviron
3、mentisundisturbed,theecologyofanareaisinbalance,butifacreatureisexterminatedoranunfriendlyspeciesintroduced,thentheecologyofthedistrictwillbeupset—inotherwords,thebalanceofnaturewillbedisturbed.Man,asapartoftheenvironment,hasdonemoretoupsettheecologyduringhisshortspanonea
4、rththananyotherlivingcreaturewithhisignorance,greed,thoughtlessfoolishnessandwastefulness•Hehadpoisonedtheatmosphereandpollutedbothlandandwater.Hehassquanderedtheearth1snaturalresourceswithnothoughtforthefuture,andhasthoughtoutthemostsavagewaysofkillinghisfellowmen—andeve
5、ryothersortoflife.Sincemanhasdonesomuchdamage,itisuptomantoputmattersright—ifitisnotalreadytoolate•Ifthereistobeanyremedyforourillszthatremedyultimatelyliesinthehandsoftheyoung,andthesoonertheystartdoingsomethingaboutit,thebetter.Oneofthemaincausesoftheearth1stroublesisth
6、eworld1soverpopulationanditsgrowingatanever-increasingrate.Meanwhileweareusingupournaturalresources—fuelsandmineralores—atanever-increasingratewithnohopeofreplacingthem.Formanyyearstheearthhasbeenunabletoprovideenoughfoodfortheserapidlyexpandingpopulationsandthepositionis
7、steadilyworseningsincethefertilityofsomeofourrichestsoilshasbeenlostandvastareasoncefertilehaveturnedintobarrendeserts•Andthetroublewithdesertsisthattheytendtocreepoutwardsontothefertilesoils.WhatisnowthenorthernSaharaDesertwasthecradleofthecivilizedworld2,500yearsago•Eve
8、natthismomentmanyoftheearth1snaturaltreasuresarebeingdestroyed,manyvaluableanimalsandplantsarebe
